Spread spectrum communication device

Abstract

A multiplex communication device by the spread spectrum communication system is disclosed, in which a reference signal and a plurality of information signals are multiplexed to be transmitted after having spreading-modulated each of them, and data demodulation for the plurality of information signals is effected on the basis of a correlation-demodulated reference signal by executing correlation operation of this multiplexed received signal with a reference signal by means of a single correlator.

What is claimed is; 
     
       1. A spread spectrum communication device provided with a transmitter comprising: serial-parallel converting means for converting serial data into a plurality of parallel data sets;   first PN code generating means for generating at least a first PN code in response to a PN clock;   spreading modulating means, in which said plurality of parallel data sets are inputted and which outputs said first PN code in the form of a plurality of modulated data sets corresponding to respective said parallel data sets;   delaying means for outputting said plurality of modulated data sets, while delaying them in time; and   RF modulating means for RF-modulating each of said plurality of delayed modulated data sets and synthesizing a signal to be transmitted by combining them.   
     
     
       2. A spread spectrum communication device according to claim 1, wherein in said transmitter said first PN code generating means generates said first PN code and a second PN code in response to a PN clock, and said spreading modulating means outputs selectively said first or second PN code in response to each of said plurality of parallel data sets. 
     
     
       3. A spread spectrum communication device provided with a receiver comprising: PN code generating means for generating in response to a PN clock a first PN code, which is identical to but inverted in time with respect to a second PN code included in a received signal;   reference signal generating means for generating a reference signal based on said first PN code;   a correlator for correlating said receiving signal with said reference signal;   converting means for converting a correlation output of said correlator into a binary signal;   sampling means for sampling said binary signal on the basis of a sampling signal generated for every predetermined period of time and converting said binary signal into a plurality of parallel data sets; and   data demodulating means for taking-in said plurality of parallel data sets with a predetermined timing and demodulating them into serial data.   
     
     
       4. A spread spectrum communication device according to claim 3, wherein said reference signal generating means RF-modulates said first PN code to obtain said reference signal. 
     
     
       5. A spread spectrum communication device according to claim 1, provided with a receiver comprising: second PN code generating means for generating in response to a PN clock a third PN code, which is identical to but inverted in time with respect to a PN code included in a received signal;   reference signal generating means for generating a reference signal based on said third PN code;   a correlator for correlating said received signal with said reference signal;   converting means for converting a correlation output of said correlator into a binary signal;   sampling means for sampling said binary signal on the basis of a sampling signal generated for every predetermined period of time and converting said binary signal into a plurality of parallel data sets; and   data demodulating means for taking-in said plurality of parallel data sets from said sampling means with a predetermined timing and demodulating them into serial data.   
     
     
       6. A spread spectrum communication device according to claim 2, provided with a receiver comprising: second PN code generating means for generating in response to a PN clock a third PN code, which is identical to but inverted in time with respect to a PN code included in a received signal;   reference signal generating means for generating a reference signal based on said third PN code;   a correlator for correlating said received signal with said reference signal;   converting means for converting a correlation output of said correlator into a binary signal;   sampling means for sampling said binary signal on the basis of a sampling signal generated for every predetermined period of time and converting said binary signal into a plurality of parallel data sets; and   data demodulating means for taking-in said plurality of parallel data sets from said sampling means with a predetermined timing and demodulating them into serial data.   
     
     
       7. A spread spectrum communication device according to claim 21, wherein said RF modulating means includes a plurality of multipliers, to at least one of the other multipliers being given said RF carrier and a respective one of said delayed modulated data sets.